﻿Geology 
  and 
  Mineralogy. 
  491 
  

  

  Report 
  of 
  the 
  State 
  Geological 
  Survey 
  for 
  the 
  fiscal 
  year 
  1915, 
  

   Bulletin 
  33, 
  gives 
  an 
  account 
  of 
  a 
  large 
  amount 
  of 
  work 
  on 
  coal, 
  

   oil 
  and 
  gas, 
  clay, 
  ground 
  water, 
  drainage, 
  topographic 
  mapping, 
  

   and 
  educational 
  bulletins. 
  Cooperation 
  with 
  the 
  Federal 
  Geo- 
  

   logical 
  Survey, 
  the 
  Bureau 
  of 
  Mines, 
  the 
  State 
  University, 
  and 
  

   various 
  coal 
  and 
  oil 
  companies 
  is 
  an 
  important 
  phase 
  of 
  the 
  State 
  

   Survey's 
  activities, 
  and 
  has 
  resulted 
  in 
  extensive 
  stratigraphic 
  

   studies 
  by 
  Professor 
  Weller, 
  Professor 
  Savage, 
  and 
  Mr. 
  Rich, 
  

   and 
  economic 
  studies 
  by 
  Fred 
  H. 
  Kay, 
  G. 
  H. 
  Cady, 
  Professor 
  

   Parr, 
  Professor 
  Stull, 
  C. 
  B. 
  Anderson, 
  and 
  others. 
  The 
  Year 
  

   Book 
  for 
  1915 
  includes 
  papers 
  on 
  Mineral 
  Resources 
  of 
  Illinois, 
  

   by 
  H. 
  J. 
  Skewes 
  ; 
  Petroleum 
  in 
  1914 
  and 
  1915, 
  by 
  Fred 
  H. 
  Kay 
  ; 
  

   Geologic 
  Structure 
  of 
  Canton 
  and 
  Avon 
  quadrangles, 
  by 
  T. 
  E. 
  

   Savage 
  ; 
  Notes 
  on 
  Bremen 
  Anticline, 
  by 
  Fred 
  H. 
  Kay 
  ; 
  Oil 
  and 
  

   Gas 
  in 
  Birds 
  and 
  Vincennes 
  quadrangles, 
  by 
  John 
  L. 
  Rich. 
  

  

  The 
  Survey 
  has 
  recently 
  issued 
  : 
  Oil 
  Investigations 
  in 
  Illinois 
  in 
  

   1916, 
  by 
  Fred 
  EL 
  Kay, 
  Albert 
  D. 
  Brokaw, 
  Stuart 
  St. 
  Clair, 
  and 
  

   Charles 
  Butts, 
  Bulletin 
  No. 
  35, 
  1917, 
  80 
  pp., 
  12 
  figs., 
  9 
  pis.; 
  Clay 
  

   Deposits 
  near 
  Mountain 
  Glen, 
  Union 
  County, 
  Illinois, 
  by 
  Stuart 
  

   St. 
  Clair, 
  extract 
  from 
  Bulletin 
  36, 
  1917, 
  15 
  pp., 
  2 
  figs. 
  Four 
  

   reports 
  of 
  the 
  Cooperative 
  Coal 
  Mining 
  Series 
  have 
  also 
  appeared 
  : 
  

   Surface 
  Subsidence 
  in 
  Illinois 
  resulting 
  from 
  Coal 
  Mining, 
  by 
  

   Lewis 
  E. 
  Young, 
  Bulletin 
  17, 
  1916, 
  pp. 
  112, 
  56 
  figs., 
  4 
  pis. 
  Tests 
  

   on 
  Clay 
  Materials 
  available 
  in 
  Illinois 
  Coal 
  Mines, 
  by 
  R. 
  T. 
  Stull 
  

   and 
  R. 
  K. 
  Hursh, 
  Bulletin 
  18, 
  1917, 
  pp. 
  130, 
  62 
  figs. 
  Chemical 
  

   Study 
  of 
  Illinois 
  Coals, 
  by 
  S. 
  W. 
  Parr, 
  pp. 
  86, 
  10 
  pis. 
  Coal 
  

   Resources 
  of 
  District 
  VI, 
  by 
  G. 
  H. 
  Cady, 
  pp. 
  94, 
  7 
  pis., 
  25 
  figs. 
  

  

  H. 
  E. 
  G. 
  

  

  5. 
  Geology 
  and 
  Economic 
  Deposits 
  of 
  a 
  Portion 
  of 
  Eastern 
  

   Montana 
  ; 
  by 
  J. 
  P. 
  Rowe 
  and 
  R. 
  A. 
  Wilson. 
  State 
  Univ. 
  Mon- 
  

   tana 
  Studies, 
  Series 
  No. 
  1. 
  Pp. 
  61, 
  27 
  figs., 
  4 
  pis. 
  — 
  The 
  strati- 
  

   graphic 
  and 
  economic 
  geology 
  of 
  6,800 
  square 
  miles 
  on 
  the 
  

   eastern 
  border 
  of 
  Montana 
  has 
  been 
  described 
  in 
  detail. 
  The 
  

   groups 
  of 
  sedimentary 
  rocks 
  present 
  are 
  the 
  Fort 
  Union 
  forma- 
  

   tion 
  (Tertiary) 
  300 
  to 
  1200 
  feet, 
  with 
  the 
  Lebo 
  shale 
  to 
  340 
  

   feet; 
  the 
  Lance 
  formation 
  (Cretaceous 
  or 
  Tertiary) 
  450 
  to 
  550 
  

   feet, 
  including 
  the 
  Colgate 
  sandstone 
  90 
  to 
  175 
  feet 
  ; 
  and 
  300 
  feet 
  

   of 
  the 
  Pierre 
  shale 
  (Upper 
  Cretaceous). 
  The 
  lignites 
  in 
  the 
  Fort 
  

   Union 
  and 
  Lance 
  beds 
  of 
  the 
  area 
  studied 
  reached 
  the 
  enormous 
  

   total 
  of 
  75,600,632,820 
  tons, 
  an 
  estimate 
  which 
  takes 
  into 
  account 
  

   only 
  beds 
  36 
  inches 
  or 
  more 
  in 
  thickness. 
  h. 
  e. 
  g. 
  

  

  6. 
  A 
  Preliminary 
  Report 
  on 
  the 
  Alkali 
  Resources 
  of 
  

   Nebraska 
  ; 
  by 
  Erwin 
  H. 
  Barbour. 
  Nebraska 
  Geol. 
  Survey, 
  

   vol. 
  4, 
  pt. 
  28, 
  pp. 
  405-438, 
  21 
  figs. 
  — 
  A 
  few 
  of 
  the 
  many 
  alkali 
  

   lakes 
  of 
  northwestern 
  Nebraska 
  carry 
  important 
  amounts 
  of 
  

   potash 
  in 
  addition 
  to 
  soda. 
  Practically 
  all 
  of 
  these 
  lakes 
  have 
  

   been 
  mapped 
  and 
  their 
  water 
  analyzed. 
  The 
  source 
  of 
  the 
  

   potash 
  now 
  being 
  obtained 
  from 
  Jess 
  Lake, 
  near 
  Alliance, 
  is 
  

   ascribed 
  to 
  the 
  local 
  vegetation. 
  h. 
  e. 
  g. 
  

  

  7. 
  Recent 
  and 
  Fossil 
  Ripple- 
  Marks 
  ; 
  by 
  E. 
  M. 
  Kindle, 
  

   Canada 
  Dept. 
  Mines, 
  Geol. 
  Survey, 
  Mus. 
  Bull. 
  25, 
  1917, 
  pp. 
  vi, 
  

  

  